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Long Term Retention Plan (Additional Information) (Details) - 6 months ended Jun. 30, 2015 - Long Term Retention Plan 2015 [Member] - $ / shares
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percent of bonus for fixed payments 8.333%
Period of fixed payments from long term retention plan 6 years
Stock price per share, average closing price $ 127.29
Long term retention plan, number of trading days 60 days
Covered termination period 120 days
Percent of award payment paid after change in control 50.00%